fix: remove duplicate substitution in postgresql patch

Author: jfroche

nix/postgresql/generic.nix

@@ -204,9 +204,6 @@ let
       postPatch = ''
         # Hardcode the path to pgxs so pg_config returns the path in $out
         substituteInPlace "src/common/config_info.c" --subst-var out
-        substituteInPlace "src/backend/commands/collationcmds.c" --replace-fail '@locale@' '${
-          if stdenv.isDarwin then darwin.adv_cmds else lib.getBin stdenv.cc.libc
-        }/bin/locale'
       ''
       + lib.optionalString jitSupport ''
         # Force lookup of jit stuff in $out instead of $lib